问题
选择题
I developed very slowly and it took nearly two hundred years I was built as an analytical machine by Charles Babbage.
A．before
B．after
C．long
D．short
答案
A
考查连词before的用法。在这里意为“才”，句意：我发展的很慢花了将近两百年的时间我才被建成一台分析机。所以选A。